Originally Posted by stealth
Yeah, I was thinking the exact same thing. Tried googling the Night Masks as it sounded familiar but it doesn't seem to a part of FR canon.

Pages 26, 143, 144, 271 and 273 of the Forgotten Realms Campaign setting (3rd edition) says they are very much canon, and that they "became the secret rulers of Westgate" in 1353. The Night Masks were also mentioned in Baldur's Gate II's Shadow Thief quest line.

— Interdum feror cupidine partium magnarum Europae vincendarum
Sometimes I get this urge to conquer large parts of Europe